There appear to be some intermittent problems with our hosting company DNS. Is the following DNS response a valid CNAME response?
When proxied through home ISP and router this seems to flip intermittently between an NXDOMAIN response and a NOERROR + CNAME resolution. My hunch is that the correct behaviour when receiving NXDOMAIN and CNAME in a single response is undefined and I'm getting a different response based on the machines my query has gone through.
dig @ns2.hostdns4u.com i.baby-gaga.com ; <<>> DiG 9.5.1-P3 <<>> @ns2.hostdns4u.com i.baby-gaga.com ; (1 server found) ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 26592 ;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 0 ;; WARNING: recursion requested but not available ;; QUESTION SECTION: ;i.baby-gaga.com. IN A ;; ANSWER SECTION: i.baby-gaga.com. 3600 IN CNAME babygaga.cachefly.net. ;; AUTHORITY SECTION: . 3600 IN SOA whg1.hostdns4u.com. amber.barnberrycupboard.com. 0 10800 3600 604800 3600 ;; Query time: 143 msec ;; SERVER: 220.127.116.11#53(18.104.22.168) ;; WHEN: Tue Jul 6 09:00:01 2010 ;; MSG SIZE rcvd: 142